i've been shooting blackpowder for a long time.... if the frizzen is down, and its a good fit, very little, if no powder should be lost. as for the ball, it should be a tight fit in the barrel. noway would the ball and powder escape....Just finish seeing the episode of where the pirate defeats the knight, the overriding conclusion of this episode was that technology was the reason for victory. Technology could have also caused the pirate to be defeated. The battle scene at the end of the program shows the pirate picking up his pistol, which had been lost on the ground while wrestling with the knight, and shooting the knight point blank in the head. The probability of the flintlock pistol being able to fire after being dropped on the ground is highly unlikely. The powder from the pan and possibly the powder in the barrel would have fallen out. I have experienced running with a loaded pistol and more times than not the powder will fall out of the pan. So in most cases like this one his pistol would have just went "click" and he would have been dead.
Martin